Researchers have developed a dongle and an app that can quickly screen for the virus and other sexually transmitted infections like syphilis.
Syphilis brought from the Americas had Europe by the short and curlies in the 1490s, and went on to affect the creativity of writers and artists.
US researchers must have known they were violating ethical standards by infecting Guatemalan prison inmates and mental patients with syphilis.
A cheap, highly portable blood test has proven to be as accurate as expensive hospital-based analyses in detecting infectious diseases.
Experiments in 1940s saw hundreds of Guatemalan prisoners and soldiers deliberately infected to test effects of penicillin.